Try getting page content with both headers

Library/Homebrew/livecheck/strategy.rb

@@ -179,46 +179,49 @@ def self.page_headers(url)
       def self.page_content(url)
         original_url = url
 
-        stdout, stderr, status = curl_with_workarounds(
-          *PAGE_CONTENT_CURL_ARGS, url,
-          **DEFAULT_CURL_OPTIONS
-        )
-
-        unless status.success?
-          /^(?<error_msg>curl: \(\d+\) .+)/ =~ stderr
-          return {
-            messages: [error_msg.presence || "cURL failed without an error"],
-          }
-        end
-
-        # stdout contains the header information followed by the page content.
-        # We use #scrub here to avoid "invalid byte sequence in UTF-8" errors.
-        output = stdout.scrub
+        stderr = nil
+        [:default, :browser].each do |user_agent|
+          stdout, stderr, status = curl_with_workarounds(
+            *PAGE_CONTENT_CURL_ARGS, url,
+            **DEFAULT_CURL_OPTIONS,
+            user_agent: user_agent
+          )
+          next unless status.success?
 
-        # Separate the head(s)/body and identify the final URL (after any
-        # redirections)
-        max_iterations = 5
-        iterations = 0
-        output = output.lstrip
-        while output.match?(%r{\AHTTP/[\d.]+ \d+}) && output.include?(HTTP_HEAD_BODY_SEPARATOR)
-          iterations += 1
-          raise "Too many redirects (max = #{max_iterations})" if iterations > max_iterations
+          # stdout contains the header information followed by the page content.
+          # We use #scrub here to avoid "invalid byte sequence in UTF-8" errors.
+          output = stdout.scrub
 
-          head_text, _, output = output.partition(HTTP_HEAD_BODY_SEPARATOR)
+          # Separate the head(s)/body and identify the final URL (after any
+          # redirections)
+          max_iterations = 5
+          iterations = 0
           output = output.lstrip
+          while output.match?(%r{\AHTTP/[\d.]+ \d+}) && output.include?(HTTP_HEAD_BODY_SEPARATOR)
+            iterations += 1
+            raise "Too many redirects (max = #{max_iterations})" if iterations > max_iterations
+
+            head_text, _, output = output.partition(HTTP_HEAD_BODY_SEPARATOR)
+            output = output.lstrip
 
-          location = head_text[/^Location:\s*(.*)$/i, 1]
-          next if location.blank?
+            location = head_text[/^Location:\s*(.*)$/i, 1]
+            next if location.blank?
+
+            location.chomp!
+            # Convert a relative redirect URL to an absolute URL
+            location = URI.join(url, location) unless location.match?(PageMatch::URL_MATCH_REGEX)
+            final_url = location
+          end
 
-          location.chomp!
-          # Convert a relative redirect URL to an absolute URL
-          location = URI.join(url, location) unless location.match?(PageMatch::URL_MATCH_REGEX)
-          final_url = location
+          data = { content: output }
+          data[:final_url] = final_url if final_url.present? && final_url != original_url
+          return data
         end
 
-        data = { content: output }
-        data[:final_url] = final_url if final_url.present? && final_url != original_url
-        data
+        /^(?<error_msg>curl: \(\d+\) .+)/ =~ stderr
+        {
+          messages: [error_msg.presence || "cURL failed without an error"],
+        }
       end
     end
   end